148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/* $NetBSD: if_agrether_hash.c,v 1.4 2017/09/26 07:42:06 knakahara Exp $ */
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/*-
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* Copyright (c)2005 YAMAMOTO Takashi,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: if_agrether_hash.c,v 1.4 2017/09/26 07:42:06 knakahara Exp $");
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/hash.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_ether.h>
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#include <net/if_vlanvar.h>
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#include <net/agr/if_agrethervar.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#define HASH(p, l, h) hash32_buf((p), (l), (h))
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static const void *agr_m_extract(struct mbuf *, int, int, void *);
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static const void *
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agr_m_extract(struct mbuf *m, int off, int len, void *buf)
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{
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const void *result;
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KASSERT((m->m_flags & M_PKTHDR) != 0);
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if (m->m_pkthdr.len < off + len) {
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result = NULL;
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} else if (m->m_len >= off + len) {
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result = mtod(m, char *) + off;
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} else {
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m_copydata(m, off, len, buf);
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result = buf;
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}
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return result;
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}
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uint32_t
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agrether_hashmbuf(struct agr_softc *sc, struct mbuf *m)
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{
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struct ether_header eh_store;
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const struct ether_header *eh;
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uint32_t hash = HASH32_BUF_INIT;
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int off = 0;
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uint16_t tci;
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uint16_t etype;
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eh = agr_m_extract(m, off, sizeof(*eh), &eh_store);
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if (eh == NULL) {
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return hash;
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}
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hash = HASH(&eh->ether_dhost, sizeof(eh->ether_dhost), hash);
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hash = HASH(&eh->ether_shost, sizeof(eh->ether_shost), hash);
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etype = eh->ether_type;
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if (etype == htobe16(ETHERTYPE_VLAN)) {
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struct ether_vlan_header vlanhdr_store;
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const struct ether_vlan_header *vlanhdr;
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vlanhdr = agr_m_extract(m, off, sizeof(*vlanhdr),
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&vlanhdr_store);
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if (vlanhdr == NULL) {
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return hash;
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}
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tci = vlanhdr->evl_tag;
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etype = vlanhdr->evl_proto;
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off += sizeof(*vlanhdr) - sizeof(*eh);
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} else if (vlan_has_tag(m)) {
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tci = htole16(vlan_get_tag(m));
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} else {
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tci = 0;
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}
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hash = HASH(&tci, sizeof(tci), hash);
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off += sizeof(*eh);
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if (etype == htobe16(ETHERTYPE_IP)) {
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struct ip ip_store;
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const struct ip *ip;
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ip = agr_m_extract(m, off, sizeof(*ip), &ip_store);
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if (ip == NULL) {
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return hash;
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}
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hash = HASH(&ip->ip_src, sizeof(ip->ip_src), hash);
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hash = HASH(&ip->ip_dst, sizeof(ip->ip_dst), hash);
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hash = HASH(&ip->ip_p, sizeof(ip->ip_p), hash);
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/* use port numbers for tcp and udp? */
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} else if (etype == htobe16(ETHERTYPE_IPV6)) {
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struct ip6_hdr ip6_store;
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const struct ip6_hdr *ip6;
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uint32_t flowlabel;
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ip6 = agr_m_extract(m, off, sizeof(*ip6), &ip6_store);
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if (ip6 == NULL) {
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return hash;
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}
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hash = HASH(&ip6->ip6_src, sizeof(ip6->ip6_src), hash);
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hash = HASH(&ip6->ip6_dst, sizeof(ip6->ip6_dst), hash);
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/* hash = HASH(&ip6->ip6_nxt, sizeof(ip6->ip6_nxt), hash); */
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flowlabel = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
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hash = HASH(&flowlabel, sizeof(flowlabel), hash);
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/* use port numbers for tcp and udp? */
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}
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return hash;
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}
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